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LM3S8630-IQR100-A2 데이터시트(PDF) 65 Page - Texas Instruments |
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LM3S8630-IQR100-A2 데이터시트(HTML) 65 Page - Texas Instruments |
65 / 546 page Figure 6-2. External Circuitry to Extend Power-On Reset PU C 1 RST Stellaris® R VDD RPU = 1 kΩ to 100 kΩ C1 = 1 nF to 10 µF If the application requires the use of an external reset switch, Figure 6-3 on page 65 shows the proper circuitry to use. Figure 6-3. Reset Circuit Controlled by Switch PU C 1 RS RST Stellaris® R VDD Typical RPU = 10 kΩ Typical RS = 470 Ω C1 = 10 nF The RPU and C1 components define the power-on delay. The external reset timing is shown in Figure 20-5 on page 510. 6.1.2.5 Brown-Out Reset (BOR) A drop in the input voltage resulting in the assertion of the internal brown-out detector can be used to reset the controller. This is initially disabled and may be enabled by software. The system provides a brown-out detection circuit that triggers if the power supply (VDD) drops below a brown-out threshold voltage (VBTH). If a brown-out condition is detected, the system may generate a controller interrupt or a system reset. Brown-out resets are controlled with the Power-On and Brown-Out Reset Control (PBORCTL) register. The BORIOR bit in the PBORCTL register must be set for a brown-out condition to trigger a reset. The brown-out reset is equivalent to an assertion of the external RST input and the reset is held active until the proper VDD level is restored. The RESC register can be examined in the reset interrupt 65 April 04, 2010 Texas Instruments-Production Data Stellaris® LM3S8630 Microcontroller |
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